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3r+7+2+r=0
We simplify the equation to the form, which is simple to understand
3r+7+2+r=0
We move all terms containing r to the left and all other terms to the right.
+3r+1r=0-7-2
We simplify left and right side of the equation.
+4r=-9
We divide both sides of the equation by 4 to get r.
r=-2.25
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